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Attenuation of late sv 40 messenger rna synthesis is enhanced by the agnoprotein and is temporally regulated in isolated nuclear systems

Attenuation of late sv 40 messenger rna synthesis is enhanced by the agnoprotein and is temporally regulated in isolated nuclear systems

Molecular & Cellular Biology 5(6): 1327-1334

Studies were performed to verify the physiological significance of attenuation in the life cycle of SV40 and the role of agnoprotein in this process. For these purposes, nuclei were isolated at various times after infection and incubated in vitro in the presence of [.alpha.-32P]UTP under the standard conditions which lead to attenuation. Attenuation was evident by the production of a 94-nucleotide attenuator RNA, revealed by gel electrophoresis. In parallel, the synthesis of agnoprotein was studied at various times after infection by labeling the cells for 3 h with [14C]arginine, lysing them, and analyzing the labeled proteins by gel electrophoresis. Both attenuation and the synthesis of agnoprotein were predominant towards the end of the infectious cycle. At earlier times, there was almost no attenuation and no synthesis of agnoprotein. There was almost no attenuation even at the latest times after infection in nuclei isolated from cells infected with SV40 deletion mutants that do not synthesize agnoprotein. Analysis by dot blot hybridization showed higher amounts of cytoplasmic viral RNA in cells infected with an agnoprotein gene insertion mutant, .DELTA.79, that does not produce agnoprotein, compared with cells infected with wild-type virus. The present studies indicate that attenuation is temporally regulated and suggest that agnoprotein enhances attentuation in isolated nuclei and that may also enhance it in vivo.

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